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2024-09-13 13:19:51 +02:00

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SQL

CREATE TABLE users (
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(50) UNIQUE NOT NULL,
email VARCHAR(100) UNIQUE NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE posts (
id INT AUTO_INCREMENT PRIMARY KEY,
user_id INT,
title VARCHAR(255) NOT NULL,
content TEXT,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY (user_id) REFERENCES users(id)
);
CREATE TABLE comments (
id INT AUTO_INCREMENT PRIMARY KEY,
post_id INT,
user_id INT,
content TEXT,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY (post_id) REFERENCES posts(id),
FOREIGN KEY (user_id) REFERENCES users(id)
);
INSERT INTO users (username, email) VALUES
('john_doe', 'john@example.com'),
('jane_smith', 'jane@example.com');
INSERT INTO posts (user_id, title, content) VALUES
(1, 'First Post', 'This is the content of the first post.'),
(2, 'Hello World', 'Hello everyone! This is my first post.');
INSERT INTO comments (post_id, user_id, content) VALUES
(1, 2, 'Great post!'),
(2, 1, 'Welcome to the community!');